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MCE Deepwater Development 2016
PAU, FRANCE • 5-7 APRIL 2016
Multi-Lines Hybrid Riser
Cost-Effective System for Deep Waters
Gilles COUSIN
SEAL Engineering
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Agenda
Challenges & Design Premise
Main Components
Outline Installation Procedure
Dynamic Behavior
New URA Design Development
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Challenges of (Ultra) Deep Water Design
Prospects at 3,000m WD or more
Deepwater (pressure) conditions
Seabed Conditions & Riser-Soil interaction
Qualification of Components
Fatigue
Etc.
Development cost effectiveness
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Design Premise
One riser bundle per reservoir (“mini” riser tower) :
Production (pipe-in-pipe riser, as stem tendon)
Gas Lift (PiP annular, injection @ riser base)
Service Line (e.g. ‘loop’ with production line)
Water Injection
Fully assembled offshore
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Main Components
‘Open’ Frame Upper Riser Assembly (URA)
Buoyancy Tank
Flexible Jumpers
Flexible Joint
URA Frame
Gooseneck Connectors
Vertical Risers
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Main Components
Lower Riser Assembly (LRA)
Rigid ‘M’ Spools
Flexible Jumpers or “Flex-tails”
Caisson Pile
Spacer
LRA Frame
Vertical Risers
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Outline Installation Procedure
Foundation Installation
Production PIP Riser deployment
URA Connection & transfer to hang-off platform
Lateral Riser Deployment
Lateral Riser Assembly to FSRx 2
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Outline Installation Procedure
Foundation Installation
Production PIP Riser deployment
URA Connection & transfer to hang-off platform
Lateral Riser Deployment
Lateral Riser Assembly to FSR
Buoyancy Tank Connection (crane master)
FSR Lowering & Connection to Foundation
Buoyancy Tank N2 Filling
x 2
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Outline Installation Procedure
Foundation Installation
Production PIP Riser deployment
URA Connection & transfer to hang-off platform
Lateral Riser Deployment
Lateral Riser Assembly to FSR
Buoyancy Tank Connection (crane master)
FSR Lowering & Connection to Foundation
Buoyancy Tank N2 Filling
RBJs Installation
Flexible Jumpers Installation
ML-FSR Pre-Commissioning
x 2
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Hydrodynamic Behavior checked, including
Different Riser Configurations (spacing, diameters…)
Vortex Induced (including Wake) Dynamics
Steady (e.g. Galloping) Instability Phenomena
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
New URA Design Development
Two-tiered design arranged around a central open pipe structural member
Flexible Joint(RotoLatch)
Gooseneck Assembly
Vertical Risers
Guiding Frame
Central Open Pipe
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
New URA Design Development
Two-tiered design arranged around a central open pipe structural member
Direct Load Transfer from Buoyancy Tank to Central Riser
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
New URA Design Development
Two-tiered design arranged around a central open pipe structural member
Direct Load Transfer from Buoyancy Tank to Central Riser
Compact design / load reductions
Previous URA Design
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
New URA Design Development
Two-tiered design arranged around a central open pipe structural member
Direct Load Transfer from Buoyancy Tank to Central Riser
Compact design / load reductions
New Load Decoupling System
Lower cost ‘clamp’ connector
Guiding Plates
Prongs
ReceptacleAlignment Key
Installation effectiveness
Cost Reduction
MCE Deepwater Development 2016
Multi-Lines Hybrid Riser System
Cost comparison with HRT and array of FSHR,
Case study: 3 reservoirs @ 1,700m water depth;
Multi Line Free Standing Riser (3 off) cost
estimate:
~17% lower than FSHR array (9 off);
~12% lower than HRT (3 off).
MCE Deepwater Development 2016
Thank You / Questions
Gilles COUSINSEAL Engineering